A smart wrist-worn device

Abstract

The present invention relates to an intelligent wrist-worn device, comprising a watch body, a first watch strap, a second watch strap and a detection circuit for detecting that the second watch strap is buckled to the watch body, wherein a first charging coil is embedded in the first watch strap and a second charging coil is embedded in the second watch strap; a microcontroller, a wireless charging module and a switching control circuit connected to the microcontroller are arranged in the watch body; one end of the first charging coil and one end of the second charging coil are both connected to the wireless charging module, and the other end of the first charging coil is connected to the wireless charging module and to the other end of the second charging coil through the switching control circuit; the microcontroller receives a detection signal from the detection circuit and controls the switching control circuit to connect the other end of the first charging coil to the wireless charging module, or controls the switching control circuit to connect the other end of the first charging coil to the other end of the second charging coil. The number of turns of the wireless charging coil is increased, and the wireless charging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wearable devices, and in particular to a smart wrist-worn device. Background Art

[0002] At present, smart wearable products (such as smart watches, smart bracelets, etc.) are very popular, and there are three main ways to charge them: USB charging port charging, metal contact point charging and wireless charging. Since wireless charging can save power cords and does not damage the appearance of the product, it is unanimously favored by users. More and more electronic products begin to support wireless charging functions. However, the current wireless charging chip only supports single-coil charging due to cost considerations, resulting in low wireless charging efficiency. Summary of the invention

[0003] The present invention provides an intelligent wrist-worn device, which can increase the number of turns of a wireless charging coil and improve the wireless charging efficiency.

[0004] In order to solve the above technical problems, the present invention proposes the following technical solutions:

[0005] A smart wrist-worn device comprises a watch body, a first watch strap and a second watch strap, characterized in that a first charging coil is embedded in the first watch strap, and a second charging coil is embedded in the second watch strap; a microcontroller, a wireless charging module and a switching control circuit connected to the microcontroller are provided in the watch body; the smart wrist-worn device also comprises a detection circuit for detecting that the second watch strap is buckled to the watch body; one end of the first charging coil and one end of the second charging coil are both connected to the wireless charging module, and the other end of the first charging coil is connected to the wireless charging module through the switching control circuit, and is connected to the other end of the second charging coil through the switching control circuit; the microcontroller receives a detection signal from the detection circuit, and controls the switching control circuit to connect the other end of the first charging coil to the wireless charging module, or controls the switching control circuit to connect the other end of the first charging coil to the other end of the second charging coil.

[0006] Furthermore, the detection circuit includes a pull-up resistor and a strap buckle switch connected in series with the pull-up resistor, and a tap between the pull-up resistor and the strap buckle switch outputs the detection signal.

[0007] Furthermore, the switching control circuit includes a first switching circuit and a second switching circuit; one end of the first switching circuit is connected to the other end of the first charging coil, and the other end is connected to the wireless charging module; one end of the second switching circuit is connected to the other end of the first charging coil, and the other end is connected to the other end of the second charging coil, wherein the first switching circuit and the second switching circuit are controlled to be turned on or off by the microcontroller according to the detection signal.

[0008] Furthermore, the first switch circuit or the second switch circuit is one of an analog switch or a relay.

[0009] Furthermore, the switching control circuit includes a control end and a single-pole double-throw switch, the single-pole double-throw switch includes a signal input end, a first signal output end and a second signal output end, the other end of the first charging coil is connected to the signal input end, the first signal output end is connected to the wireless charging module, and the second signal output end is connected to the other end of the second charging coil, and the control end controls the signal input end to be connected to the first signal output end or to the second signal output end.

[0010] Furthermore, the watch body also includes a rechargeable battery, and the rechargeable battery is connected to the wireless charging module.

[0011] Furthermore, the meter body also includes a display module connected to the microcontroller and a display screen connected to the display module, which are used to display the charging status and power level.

[0012] Furthermore, the smart wrist-worn device is a smart watch.

[0013] Furthermore, the detection circuit is arranged in the watch body or in the second watch strap, preferably in the second watch strap.

[0014] Compared with the prior art, the advantages and beneficial effects of the smart wrist-worn device of the present invention are: when the detection circuit detects whether the second strap is buckled to the watch body, when the detection circuit does not detect that the second strap is buckled to the watch body, a first detection signal is output, at which time the microcontroller controls the switching control circuit to only connect the first charging coil to the charging circuit, and only the first charging coil is used for wireless charging; when the detection circuit detects that the second strap is buckled to the watch body, a second detection signal is output, at which time the microcontroller controls the switching control circuit to connect the first charging coil and the second charging coil in series in the charging circuit, and the first charging coil and the second charging coil are used together for wireless charging, thereby expanding the number of turns of the receiving coil, increasing the magnetic flux passing through the receiving coil, and thereby improving the charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A block diagram of the wireless charging principle of an embodiment of a smart wrist-worn device of the present invention;

[0017] Figure 2 is a schematic diagram of a detection circuit in the smart wrist-worn device of the present invention;

[0018] Figure 3 This is the first embodiment of the switching control circuit in the smart wrist-worn device of the present invention;

[0019] Figure 4 This is the second embodiment of the switching control circuit in the smart wrist-worn device of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Wireless charging uses the principle of electromagnetic wave induction for charging. The principle is similar to that of a transformer. There is a coil at the transmitting end and the receiving end. The transmitting end coil is connected to a wired power supply to generate an electromagnetic signal. The receiving coil senses the electromagnetic signal at the transmitting end to generate current. To improve the charging efficiency, it is necessary to increase the magnetic flux passing through the receiving coil (for example, increase the length of each turn in the coil or the number of turns). However, due to the small size of smart wrist-worn products and cost considerations, the wireless charging efficiency of products is generally low in the prior art. In order to improve the wireless charging efficiency, this embodiment relates to a smart wrist-worn device, such as a smart bracelet, a smart watch, etc. Figure 1As shown, it includes a watch body 10, a first watch strap 20 and a second watch strap 30, wherein a first charging coil L1 21 is embedded in the first watch strap 20, and a second charging coil L2 31 is embedded in the second watch strap 30; a microcontroller 11, a wireless charging module 12 and a switching control circuit 14 are provided in the watch body 10, and the smart wrist-worn device also includes a detection circuit 13 for detecting that the second watch strap 30 is buckled to the watch body 10; one end of the first charging coil L1 21 is connected to the wireless charging module 12 (for example, it can be a charging output terminal output), and the other end is connected to the wireless charging module 12 (for example, it can be a charging input terminal input) through the switching control circuit 14; one end of the second charging coil L2 31 is connected to the wireless charging module 12 (for example, it can be a charging input terminal input), and the other end of the first charging coil L1 21 is connected to the second charging coil L2 31 through the switching control circuit 14. The microcontroller 11 receives the detection signal of the detection circuit 13, and controls the switching control circuit 14 to connect the other end of the first charging coil L1 21 to the wireless charging module 12 (for example, the charging input terminal input), or controls the switching control circuit 14 to connect the other end of the first charging coil L1 21 to the other end of the second charging coil L2 31. In this embodiment, the first charging coil L1 21 and the second charging coil L2 31 both act as wireless receiving coils. The detection circuit 13 can be set in the watch body 10 or in the second strap 30, preferably in the second strap 30, so as to save space in the watch body 10 and realize the miniaturization of the wristband product.

[0022] Specifically, Figure 2As shown, the detection circuit 13 of this embodiment includes a pull-up resistor R and a strap buckle switch K connected in series with the pull-up resistor R. The strap buckle switch K is a conductive switch arranged on the second strap 30. When the second strap 30 is not buckled onto the watch body 10, the switch K is in an unclosed state. When the second strap 30 is buckled onto the watch body 10, it is equivalent to pressing the switch K, and the switch K is in a closed state. The microcontroller 11 determines whether the second strap 30 is currently buckled onto the watch body 10 by collecting the detection signal between the pull-up resistor R and the switch K. When the detection signal collected by the microcontroller 11 is the first detection signal, that is, a high level, it indicates that the second strap 30 is not buckled onto the watch body 10. At this time, the microcontroller 11 sends a first control signal to the control end of the switching control circuit 14. The first control signal controls the switching control circuit 14 to connect the other end of the first charging coil L1 21 to the charging input end input of the wireless charging module 12, so as to connect the first charging coil L1 21 to the charging circuit. When the electronic device is placed on the wireless charger, the wireless transmitting coil in the wireless charger generates current due to the connection to the external power supply, and then generates an electromagnetic signal. The first charging coil L1 21 generates current after sensing the electromagnetic signal, so that the rechargeable battery 15 of the electronic device can be wirelessly charged. When the detection signal collected by the microcontroller 11 is the second detection signal, that is, a low level, it indicates that the second strap 30 is buckled onto the watch body 10. At this time, the microcontroller 11 sends a second control signal to the control end of the switching control circuit 14. The second control signal controls the switching control circuit 14 to connect the other end of the first charging coil L1 21 to the second charging coil L2 31, so that the first charging coil L1 21 and the second charging coil L2 31 are connected in series to the charging circuit. The second charging coil L2 31 is an extension of the first charging coil L1 21, which is equivalent to increasing the number of coil turns, thereby increasing the magnetic flux passing through the receiving coil. When the electronic device is placed on the wireless charger, the electromagnetic signal emitted by the wireless transmitting coil increases through the magnetic flux of the first charging coil L1 21 and the second charging coil L2 31, thereby improving the charging efficiency and power of the rechargeable battery 15, and realizing fast and high-power charging.

[0023] In the first embodiment, if Figure 3As shown, the switching control circuit 14 may include a first switch circuit and a second switch circuit; for example, the first switch circuit and the second switch circuit are both high-level conductive switch elements, and the microcontroller 11 sends, for example, a high-level first control signal EN1 to the first switch circuit, and the first switch circuit is turned on, so that the other end of the first charging coil L121 is connected to the charging input terminal input of the wireless charging module 12, and only the first charging coil L1 21 is used as a receiving coil; the microcontroller 11 sends, for example, a high-level second control signal EN2 to the second switch circuit, and the second switch circuit is turned on, and the first charging coil L1 21 and the second charging coil L2 31 are connected in series as receiving coils. In this embodiment, the first switch circuit or the second switch circuit may be any one of an analog switch or a relay, preferably an analog switch, because the analog switch is small in size and suitable for being placed in a miniaturized smart wrist-worn product, reducing the complexity of the structural design.

[0024] In the second embodiment, if Figure 4 As shown, the switching control circuit 14 can be a single-pole double-throw switch having a control terminal EN, a signal input terminal IN, and two signal output terminals OUT1 and OUT2. The other end of the first charging coil L1 21 is connected to the signal input terminal IN, the signal output terminal OUT1 is connected to the charging input terminal input of the wireless charging module 12, and the signal output terminal OUT2 is connected to the other end of the second charging coil L2 31. The first control signal output by the microcontroller 11 is transmitted to the control terminal EN, so that the signal input terminal IN is connected to the signal output terminal OUT1, and the first charging coil L1 21 is connected to the charging circuit; the second control signal output by the microcontroller 11 is transmitted to the control terminal EN, so that the signal input terminal IN is connected to the signal output terminal OUT2, and the first charging coil L1 21 and the second charging coil L2 31 are connected in series to the charging circuit. In this embodiment, the switching control circuit 14 can be an analog switch circuit, such as a single-channel analog switch SGM3157YC6 or a dual-channel analog switch NLAS2750MUTAG.

[0025] In addition, a display module 16 and a display screen (not shown) connected to the display module 16 are also provided in the watch body 10. When the microcontroller 11 controls the charging of the rechargeable battery 15, the charging status and the power level can be displayed on the display screen. In addition, a power management circuit (not shown) can also be provided for the rechargeable battery 15 to manage the power level and the charging status of the rechargeable battery 15, and to remind the user when the power level is low.

[0026] In the smart wrist-worn device of this embodiment, when the detection circuit 13 does not detect that the second strap 30 is buckled onto the watch body 10, only the first charging coil L1 21 is used for wireless charging. When the detection circuit 13 detects that the second strap 30 is buckled onto the watch body 10, the first charging coil L1 21 and the second charging coil L2 31 are connected in series for wireless charging, thereby achieving the purpose of expanding the number of turns of the wireless receiving coil, increasing the magnetic flux passing through the receiving coil, and thus improving the charging efficiency. The first charging coil L1 21 is arranged in the first strap 20 and the second charging coil L2 31 is arranged in the second strap 30, which does not occupy the space in the watch body 10, saves the volume of the watch body 10, and is conducive to miniaturization of the device.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A smart wrist-worn device, comprising a watch body, a first watch strap and a second watch strap, characterized in that: A first charging coil is embedded in the first strap, and a second charging coil is embedded in the second strap; a microcontroller, a wireless charging module and a switching control circuit connected to the microcontroller are arranged in the watch body; the smart wrist-worn device further comprises a detection circuit for detecting that the second strap is buckled to the watch body, the detection circuit comprises a pull-up resistor and a strap buckle switch connected in series with the pull-up resistor, when the second strap is not buckled to the watch body, the strap buckle switch is in an unclosed state, and when the second strap is buckled to the watch body, the strap buckle switch is in a closed state; One end of the first charging coil and one end of the second charging coil are both connected to the wireless charging module, and the other end of the first charging coil is connected to the wireless charging module through the switching control circuit, and is connected to the other end of the second charging coil through the switching control circuit; the microcontroller determines whether the second watch strap is currently buckled onto the watch body by collecting the detection signal between the pull-up resistor and the switch, and controls the switching control circuit to connect the other end of the first charging coil to the wireless charging module, or controls the switching control circuit to connect the other end of the first charging coil to the other end of the second charging coil.

2. The smart wrist-worn device according to claim 1, characterized in that: The switching control circuit includes a first switch circuit and a second switch circuit; one end of the first switch circuit is connected to the other end of the first charging coil, and the other end is connected to the wireless charging module; one end of the second switch circuit is connected to the other end of the first charging coil, and the other end is connected to the other end of the second charging coil, wherein the first switch circuit and the second switch circuit are controlled by the microcontroller to be turned on or off according to the detection signal.

3. The smart wrist-worn device according to claim 2, characterized in that: The first switch circuit or the second switch circuit is one of an analog switch or a relay.

4. The smart wrist-worn device according to claim 1, characterized in that: The switching control circuit includes a control end and a single-pole double-throw switch, the single-pole double-throw switch includes a signal input end, a first signal output end and a second signal output end, the other end of the first charging coil is connected to the signal input end, the first signal output end is connected to the wireless charging module, and the second signal output end is connected to the other end of the second charging coil, and the control end controls the signal input end to be connected to the first signal output end or to the second signal output end.

5. The smart wrist-worn device according to any one of claims 1 to 3, characterized in that: The watch body also includes a rechargeable battery, and the rechargeable battery is connected to the wireless charging module.

6. The smart wrist-worn device according to any one of claims 1 to 3, characterized in that: The meter body also includes a display module connected to the microcontroller and a display screen connected to the display module, which are used to display the charging status and power.

7. The smart wrist-worn device according to any one of claims 1 to 3, characterized in that: The smart wrist-worn device is a smart watch.

8. The smart wrist-worn device according to any one of claims 1 to 3, characterized in that: The detection circuit is arranged in the watch body or in the second watch strap.

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